| 1 | Natl Fuel Gas Supply Corp | Williamsville, NY 14221-5887 | Oil & Gas Operator | Dec 2009 |
| 2 | Natural Energy Dev Corp | Pittsburgh, PA 15241-1548 | Oil & Gas Operator | Dec 2018 |
| 3 | Natural Oil & Gas Corp | Bradford, PA 16701 | Oil & Gas Operator | Dec 2023 |
| 4 | NCL Natural Resources LLC | Spring, TX 77381-5261 | Oil & Gas Operator | Dec 2017 |
| 5 | Nea Cross Inc | Erie, PA 16508-2769 | Gas Operator | Dec 1991 |
| 6 | New Century Energy Inc | MC Donald, PA 15057-2163 | Oil & Gas Operator | Dec 2021 |
| 7 | New York Natural Gas Corp | Pittsburgh, PA 15222-1402 | Gas Operator | Dec 1990 |
| 8 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 9 | Norbert J Baumgart | Warren, PA 16365-3403 | Oil & Gas Operator | Dec 2009 |
| 10 | Nornew Inc | Houston, TX 77063-2140 | Oil & Gas Operator | Dec 2008 |
| 11 | North Amer Oil & Gas Drilling Co Inc | Pleasantville, PA 16341-0197 | Oil Operator | Dec 1999 |
| 12 | North Cambria Fuel Co | Blairsville, PA 15717-7961 | Gas Operator | Dec 2008 |
| 13 | North East Gas & Oil Co | Scottsville, VA 24590-3962 | Oil & Gas Operator | Dec 2013 |
| 14 | North John M | Valatie, NY 12184-5005 | Gas Operator | Dec 2014 |
| 15 | North Penn Gas Co | Allentown, PA 18101-1139 | Gas Operator | Dec 2000 |
| 16 | North Star Energy Resources LLC | Waynesburg, PA 15370-3833 | Gas Operator | Dec 2024 |
| 17 | Northeast Natural Energy LLC | Charleston, WV 25301-2719 | Oil & Gas Operator | Sep 2025 |
| 18 | Northeastern Opr Co Inc | Shelocta, PA 15774-2346 | Gas Operator | Dec 2024 |
| 19 | Northwest Natural Gas Co | Albion, PA 16401-9998 | Oil & Gas Operator | Dec 1990 |
| 20 | Northwestern Inc | East Brady, PA 16028 | Gas Operator | Dec 2012 |
| 21 | Noumenon Corporation | Core, WV 26541-7072 | Oil & Gas Operator | Dec 2024 |
| 22 | NTS Energy LLC | Indiana, PA 15701-1801 | Oil & Gas Operator | Dec 2015 |
| 23 | Nucomer Energy LLC | Erie, PA 16510 | Oil & Gas Operator | Sep 2025 |
| 24 | Nys Natural Gas Co | Englewood, CO 80111-4737 | Gas Operator | Dec 1984 |
| 25 | Nytis Exploration Company LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2021 |